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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Jun. 30, 2014
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Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | $ 150,405 us-gaap_AssetsFairValueDisclosure |  | $ 225,405 us-gaap_AssetsFairValueDisclosure |
Money Market Funds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 2,699 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember | [1] | 13,634 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember | [1]
Corporate Bonds And Notes |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 45,167 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember |  | 44,474 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember |
Municipal Bonds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 83,608 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember |  | 144,158 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember |
Federal Agency Issues |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 18,931 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember |  | 23,139 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember |
Level 1 |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 2,699 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 13,634 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Level 1 | Money Market Funds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 2,699 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] | 13,634 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1]
Level 2 |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 147,706 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 211,771 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Level 2 | Corporate Bonds And Notes |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 45,167 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 44,474 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Level 2 | Municipal Bonds |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | 83,608 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 144,158 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_MunicipalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Level 2 | Federal Agency Issues |  |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |  |
Total fair value of financial assets | $ 18,931 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | $ 23,139 us-gaap_AssetsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasuryAndGovernmentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[1] | Money market funds are primarily comprised of exchange traded funds and accrued interest

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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